CVE-2026-4170Public exploitNetwork attack vector

Unauthenticated command execution via template_path injection

Published Mar 15, 2026 · Updated Mar 15, 2026

OS command injection in Topsec TopACM 3.0 allows remote attackers to execute commands through the template_path HTTP parameter. The nmc_sync.php HTTP handler uses attacker-controlled template_path data when constructing an OS command without proper neutralization. No authentication or user interaction is required, and successful exploitation grants command execution with the handler's privileges.

CVSS severity9.8
Critical
EPSS probability2.80%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Topsec TopACM 3.0 allows remote attackers to execute commands through the template_path HTTP parameter. The nmc_sync.php HTTP handler uses attacker-controlled template_path data when constructing an OS command without proper neutralization. No authentication or user interaction is required, and successful exploitation grants command execution with the handler's privileges.

The record

CVE
CVE-2026-4170
Published
Mar 15, 2026
Updated
Mar 15, 2026
Vendor
Beijing Topsec Network Security Technology Co., Ltd.
Product
Topsec Internet Behavior Management System
Classifications
CWE-78, CWE-77, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Beijing Topsec Network Security Technology Co., Ltd. · Topsec Internet Behavior Management Systemversion=3.0

Published CVSS scores

8.9VulDBCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
9.8VulDBCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0VulDBAV:N/AC:L/Au:N/C:C/I:C/A:C

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-77Improper Neutralization of Special Elements used in a Command ('Command Injection')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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